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Weighted average assumptions (Details 5)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Pension Benefits
   
Used to determine benefit obligation    
Discount rate 3.65% 4.16%
Expected return on plan assets 7.00% 7.75%
Used to determine benefit cost    
Discount rate 4.16% 5.26%
Expected return on plan assets 7.75% 7.75%
Rate of compensation increase   4.00% [1]
Other Postretirement Benefits
   
Used to determine benefit obligation    
Discount rate 3.67% 4.13%
Expected return on plan assets 6.00% 6.75%
Rate of compensation increase 4.00% 4.00%
Used to determine benefit cost    
Discount rate 4.13% 5.21%
Expected return on plan assets 6.75% 6.75%
Rate of compensation increase 4.00% 4.00%
[1] * Effective June 30, 2011 and September 30, 2012, all benefit and service accruals for a union plan were frozen. Compensation increases had previously been frozen for all other plans.